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ISO / ANSI Model CNMG120404L-S CNMG431L-S Inscribed Circle (IC) 12
To maximize surface gloss
It has better resistance to thermal cracking
BEYOND S12M-SSSCR09 Precision 12mm Solid Alloy Steel Shank Screw-Clamped Right-Hand CNC Lathe Internal Boring Bar (150mm Total Length)
Mitsubishi CNMG120404-GK MC5015 Cast Iron Turning Insert (10pcs) 50 Degree Cutting Edge ISO / ANSI Model CNMG120404L-SCNMG120404 GK MC5015 Cast Iron Specialist MC5015 Abrasive Resistance GK Robust Geometry Optimized for Abrasive Cast Iron Environments MC5015 Grade (The Wear Barrier): The MC5015 is Mitsubishi's premium CVD grade for K Class (Cast Iron). Cast iron is notoriously abrasive; this grade combats that with a specialized thick alumina ($Al_2O_3$) coating that provides industry leading flank wear resistance. This allows for significantly higher cutting speeds
